Propeller fofc steam-vessels



(K0 Model.) A. COOPER.

'PROPELLER FOR STEAM VESSELS.

Patented Feb. 18, 1890.

IfiVENTORZ WITNESSES;

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ATTORNEY.

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UNITED STATES PATENT OFFICE.

ALFRED COOPER, OF BALTIMORE, MARYLAND.

PROPELLER FOlR STEAM-VESSELS.

SPECIFICATION forming part of Letters Patent No. 421,818, dated February18,1890.

Application filed November 22, 1889. Serial No. 331,149. (N 0 model.)

T0 0% whom it may concern.-

Be it known that I, ALFRED COOPER, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Propellers for Steam-Vessels, of whichthe following is a specification.

This invention relates to an improved propeller for steam-vessels, andis illustrated in the drawings, in which- Figure 1 is a side view of thehull of a vessel having my propeller. Fig. 2 is a vertical cross-sectionof the hull, showing the position of the side propellers in thechambers. Figs. 3 and 4 are separate views of the propeller.

The letter A designates the hull, which has at each side an outsidecavity or chamber 1) for the revoluble propeller O. The shaft d projectsthrough the hull side, and the propeller G is mounted thereon, so thatthe upper part of the propeller will be housed in the chamber 12. Thetwo propellers may be on one shaft, or, as here shown, each one maybe ona different shaft. The shafts-are provided with cranks e or otherequivalent means to be driven by engines.

The propellers O are an improved construc- They have in the presentinstance four radial frames or pairs of arms f, though obviously agreater or less number may be used. Each pair of arms carry severalblades or buckets g. These blades are arranged at an oblique angle tothe radial frames, all the blades being inclined in the same direction,as shown in Fig. 3 of the drawings. In the present instance the sidearms f are united by a cross-bar f and form a frame. It will be seen theblades are substantially flat and have position between the two radialarms f, and each end of the blade is rigidly'attached to one of thearms. The blades are separated, an open space 71 being between one bladeand the next one on the same arm.

The construction, as described, of this propeller is well calculated tooperate eifectively without counter-resistance. At the moment the bladeson each arm have done their effective work on the water the arm risesand enters the chamber 1) and is carried up over the shaft, and thencomes down again with the diagonal blades in the position to be mosteffective.

It is obvious that a vessel may have, in addition to these two sidepropellers, an ordinary stern propeller, whereby the propulsive forcewill be increased.

The propellers may be made of wood or metal, and the parts may have anydesired proportion. Slight changes in the construction may be madewithout departing from my invention.

Having described my invention, -I claim-= The combination, with the,hull of a vessel having at each side a chamber 1), of a shaft (1,havinga crank midway between its ends, and the propeller-wheels securedto said shaft and having inclined radial frames f, carrying rigid bladesarranged all in the same direction and at an oblique angle to the radialframes, the upper part of each propeller-wheel being housed in one ofthe chambers, substantially as specified.

In testimony whereof I affix my signature in the presence of twowitnesses.

ALFRED COOPER. Witnesses:

J OHN E. MORRIS, JNo. T. MAnDoX.

